Method of winding coils



May 2l, 1929. A. H. ADAMS ErAL 1,713,941

METHOD OF WINDING COILS v Filed 0G11. 29, 1927 lll HI HWI! HIIHIIIIHIMII,

'i 35 tinued in the usual manner.

Patented May 21, 1929.

UNITED STATES PATENT OFFICE,A

ARTHUR HERMAN ADAMS AND CLEM H. FRANKS, OF LA GRANGE, ILLINOIS, ASSIGN- ORS TQ WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., .A

CORPORATION OF NEW YORK- METHOD OF WINDING COILS.

Application led, October 29, 1927. Serial No. 229,556.

This invention relates to a method of winding coils, and more particularly to a method of winding coils or helices of wire for electrical pur oses.

The principal o ject of the invention is to provide a simple and inexpensive method of introducing improved leadingout conductors inelectrical coils.

The present invention may be cm' loycd to particular advantage in the manu acturc of paper filled coils wherein a plurality of coils are simultaneously wound upon a single core at separated zones therealong, the individual coils being subsequently separated by severing the core between the adjacent coils of each pair. It should be understood, however, that the novel features of the invention are not to be limited to this particular type of electrical coils except in 2o so far as defined in the appended claims.

In accordance with the general features of the invention, an improved method of introducing leading-out conductors in electrical coils of the above type consists in applying several turns of an uninsulated preferably strandedy electrical conductor u on a core preliminary to starting the win ing of they coils. These conductor turns vare placed closer together at positions where the core is subsequently severed to separate the individual coils, A sheet of pa er or other suitable insulating material is tiien wrapped around the uninsulatedstranded conductor, after which the winding of the coils is con- The completely wound coils are separated into individual coils by severing the core at points intermediate each pair of adjacent coils,

y and the uninsulated conductor, together with thew'inner end of the coil wire, are drawn out and twisted together to form the im roved leading-out conductor.

n the accompanying drawing which illustrates the several steps in the present embodiment of the invention,

Fig. 1 is anelevational view of a tubular core illustrating the manner in which .the uninsulated stranded conductor is applied thereon;

Fig. 2 is" an elevational, view similarto Fig. 1 illustrating the manner in which a plurality of coil wires are attached to the drawn out and twisted together to form the l leading-out conductor.

VReferring now to the drawing wherein like reference characters denote correspondingparts throughout the several views, the numeral 10 designates a paper tube which is used as a spindle or core upon which a plurality of coils are simultaneously wound, and for this purpose the tube 10 may be mounted in a winding machine (not shown) wherein the winding may be done automatically or, in so far as the present invention is concerned, the winding may be done manually or semi-automatically.

Before starting the winding of the coils, a loosely stranded uninsulated electrical conductor 12 is wound around the full length of the tube 10 at varying helices which, as clearly shown in Figs. 1 and 2, are placed closer together near the ends of the tube and at the positions indicated by the dotted lines 14 and 15, where it will be understood, the tube is severed in order to separate individual coils after they have been completely wound. Before starting the winding of the coils the suppl wires 16 are attached to the strandedcon uctor 12, as shown in Fig. 2'. This may be accomplished in any suitable manner, as for instance by looping the ends of the supply wires around one or more helices of the conductor 12. A sheet of paper 18 or other suitable insulating materlal is placed in position to be wrapped ,around the conductor 12, after which the Iurality of coils are simultaneously wound 1n the usual manner, a sheet of paper 18 beare built up.

After the coils have been completely wound, the tubular core 12 and the interleaving sheets of paper 18 are severed at or near" the positions indicated by the dotted. lines 14 and 15, thus separating the individual coils. A coil which has been completely wound and separated in this manner isv illustrated in Fig. 4. lThe uninsulated stranded conductor and the inner end portion of the coil wire are drawn out and after the insulation has been removed from the coil wire it is twisted with thev stranded conductor to form the inner lead of the coil.

It is obvious that many advantages are gained in practicing the present invention since a durable and iexible leading-out conductor is provided at a minimum expense. The leadlng-out conductor y1s r1g1dl `se-` cured in place by the supermpose coil windings. Furthermore, -the soldering operation which has been necessary heretofore in connecting the lead to the coil is eliminated which, obviously, saves an appreciable amount of time and labor, thereby decreasing the cost of t-he coil.

Although the invention is herein illustrated and described'in connection with the manufacture of one particular type of electrical coil, it is to be understood that the novel features thereof are capable of other applications within the scope of the appended claims.

What i's 'claimed is: v

1. A method of producing electrical coils, which consists in applying a conductor around ay core, wrapping a sheet of insulating material around the conductor, winding the coil, withdrawing the conductor and the inner end portion of the coil and then twisting the conductor with the inner end ortion of the coil to form the inner leadingout conductor of the coil.

2. A method of producing electrical coils, which consists in applying several turns of an electrical conductor around a core, at-

taching one end of the winding material to the conductor, wrapping a sheet of insulating material around the conductor and simultaneously starting the winding of the coil and then withdrawing the conductor an the inner end portion of the completed coil and twisting them together to form the inner leading-out conductor of the coil.

3. A method of producing electrical coils, which consists in applying an uninsulated electrical conductor upon a, cpre, wrapping of the coil wire to form the inner leading' out conductor of the coil.

4. A method of producing electrical coils, which consists in applying a plurality of turns of an uninsulated stranded electrical conductor around a core, attaching one end of the coil winding material to the uninsulated conductor, wrapping a sheet of insulating material around the uninsulated'conductor and simultaneously starting the winding of the coil, and then withdrawing the uninsulated conductor and the inner end portion of the coil wire and twisting them together to form the inner leading-out conductor ofthe coil.

5. A method of simultaneously `winding a plurality of coils, which consists in applying a plurality7 of turns of an uninsulated conductor upon the full length of a core in such manner that the turns are placed closer together at separated zones thereon, attaching one end of a coil ywinding material to the uninsulated conductorat each of said zones, wrapping a sheet of insulating material upon the uninsulated conductor and simultaneously starting the winding of the coils, separating the completely Wound coils by severing the core intermediate said zones, and then withdrawing the uninsulated conductorl and the inner end portion of the coil wire of each individual coil and twisting them together to/form the inner leadingout conductor for the coil.

In witness whereof, we hereunto subscribe our names this 18th day of October, A. D.

ARTHUR HERMAN ADAMS. oLEM H. FRANKS. 

